Turbine blading



May 26, 1925. v

H. T. HERR TURBINE BLADING Filed April 1922 WITNESSES:

AT I'ORNEY YATES PATENT GFFECE.

HERBERT T. HERB, OF MERIDIT, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELEC- TRIC 6c EIANUEACTURING COMPANY,

A CQ'R-PQRATION OF PENNSYLVANIA TURBINE BLAD ING.

Application filed April 21, 1922 To all whom it may concern:

Be it known that l, ITERBERT T. Hnnu, a citizen of the United States, and a resident of Merion, in the county of Montgomery and State of Pennsylvania, have invented a new and useful Improvement in Turbine Blading, of which the following is a specification.

My invention relates to turbine blading, more particularly to exhaust blading of the wide type, and it has for its object to provide apparatus of the character designated which shall have an improved type of lashing to limit or avoid vibration of the blades.

Apparatus embodying features of my invention is illustrated in the accompanying drawings, forming a part of this application, in which: Fig. 1 is a longitudinal sectional View of a turbine having wide exhaust blades with my improved lashing applied thereto; and Figs. 2 and 3 are detail views showing the relation of my improved lashing with respect to the blading.

My present invention comprises lashing means which is particularly suitable for use in connection with wide exhaust blades adapted to receive steam flowing in an axial direction and to discharge it peripherally, such, for example, as is disclosed in the applications of Alexander T. Kasley, Serial No. 186,517, tiled July 21, 1921, and of Christian Gilson, Serial No. 554,988, filed April 18, 1922, both of which are assigned to the li estinghouse Electric 8: h/[anufacturing Company.

Referring to the drawings for a more detailed description of my invention, I show a turbine comprising a rotor 10, having journals 11 fitting in the bearings 12 of a cylinder or casing 13, and suitable energyab stracting elements carried by the rotor 10 and by the cylinder or casing 1-3 and including a last, lowpressure stage 14. comprising a row of stationary guide blades 15 and a moving row of wide blades 16 adapted to receive steam lowing in an axial direction and to discharge it radially or peripherally. My invention relates to lashing means for the wide exhaust blades 16.

The wide blades 16 are of the type referred to in the applications aforesaid, that is, they are adapted to receive steam laterally and to discharge it peripherally or at the tips. Each blade preferably comprises an inner approx? imately radial or plane portion 17 and an outer curved or spoon-outline portion 18,

Serial 'No. 555,903.

The curved or spoon-outline portions 18 of the blades cooperate to define nozzle passages for expanding and discharging steam peripherally at small angles. In order to facilitate the i'i'ianufacture of the wide exhaust blades, they may be made in sections 19, as more particularly set forth in the application of Christian Gilson, aforesaid.

I show a plurality of lashing members 21 secured to the tips of the wide exhaust blades 16 in order to limit or avoid vibration thereof. These lashing members are preferably constructed as flat annular strips which fit slots provided in the tips of the blades. The lashing members or strips are arranged radially of the blades so as to interfere as little as possible with the steam flow, and they preferably extend inwardly to or just beyond the throat portions of the nozzle passages between the blades.

The blades are provided with radial slots or recesses 22, to receive the lashing members 21 and the latter are secured in the slots or, recesses and to the blades in any suitable manner, as by soldering, welding, or by riveted mortise and tongue connections. The slots 22 are preferably cut in the blades on a lathe after the blades are assembled; and, if blading of the sectional type is used, the slots are so disposed as to be half in one section and half in the adjacent section, so that the lashing members, not only serve to lash the blades together, but also to secure adjacent sections together. However, it will be obvious that the blades may be provided with appropriate notches or slots 22 before the blades are assembled. End notches 22' are preferably provided at the sides of each blade and lashing members 21 are secured thereto either by soldering or welding.

From the structure described, it will be apparent to those skilled in the art that .1 have devised simple and reliable means for bracing or lashing together exhaust blades of the wide type adapted to receive steam axially and to discharge it peripherally.

While I have shown my invention in but one form, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various other changes and modifications, without departing from the spirit thereof, and I desire, therefore, that only such limitations shall be placed thereupon as are imposed by the prior art or as are specifically set forth in the appended claims.

\Vhat- I claim is:

1. In a turbine, a row of blades having curved tips defining nozzle passages and flat lashing strips secured to the blades transversely of the passages and edgewise thereof. V

2. In a turbine, a row of blades having curved tips defining nozzle passages and fiat lashing members secured to the blades transversely of the nozzle passages and arranged edgewise thereof.

3. In a turbine, a row of blades adapted to receive elastic fluid axially and to discharge it peripherally and having curved outer portions for discharging elastic fluid at small peripheral angles and a plurality of lashing members secured to the curved outer portions in order to reinforce the blade structure.

4. In a turbine, a row of blades adapted to receive elastic fluid axially and to discharge it peripherally and having curved blade portions to discharge elastic fluid at small angles and a lashing member secured to the curved outer portions for reinforcing the blade structure. 7 V

5. In a turbine, a row of blades adapted to receive elastic fluid flowing in an axial direction and to discharge it peripherally,

each blade consisting of a plurality of sections placed'side by side, and lashing members for reinforcing the blade structure se cured to adjoining sections of the blades.

6. In a turbine, a row of blades adapted to receive elastic uid flowing axially and to discharge it peripherally, each of the blades made up of a plurality of sectionsv and lashing members for the blades secured to adjoining sections.

8. In aturbine, a row of tip-discharging blades, each of which is composed of a plurality of sections having narrow slots arranged between the sections at the tips, and narrow lashing members secured in the'slots and to adjacent blade sections in order to reinforce the blading against vibration and to secure the blade sections together at the tips.

to receive steam owing axially and to discharge it peripherally, each of the blades comprising a plurality of sections having outer curved portions with recesses at the outer sides thereof, and lashing members arranged in the recesses and secured to the.

blade sections, the lashing members. ar-

9. In a turbineii a row of blades adapted ranged in the recesses between adj acentv sections also serving to secure the sections of the blade together.

In testimony whereof, I have hereunto subscribed my name this 18th day of April,

HERBERT T. HERB. 

